Truss bridge und hammer: was sie gemeinsam haben

1. Schritt 1. Truss bridge — nutzt — Railway track. Railway bridges.
2. Schritt 2. Railway track — nutzt — Rolling mill. Rails are rolled.
3. Schritt 3. Rolling mill — nutzt — Water wheel. The first mills were turned by water.
4. Schritt 4. Water wheel — ist Teil von — Trip hammer. The shaft was turned by a water wheel.
5. Schritt 5. Trip hammer — entwickelte sich aus — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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